Seal in a gas turbine engine component having a coating with abradability proportional to interaction rate

摘要

A seal and a method of forming the seal in a gas turbine engine component. The seal between an airfoil (26;28) with a radial end (26T;28T) and a seal member adjacent it is coated with an abrasive layer (66;76) having a ceramic component in a matrix of a metal alloy with hexagonal BN. The ceramic component is selected from silica, quartz, alumina, zirconia and mixtures thereof and the metal is selected from nickel, cobalt, copper and iron. The ceramic ranges from about 1% to about 10% and the amount of nickel, cobalt, copper or iron will range from about 30% to about 60% by volume, and the balance is hBN.